diff --git a/src/daemon/service-env.test.ts b/src/daemon/service-env.test.ts
index c9e86f7cf13..44d74009deb 100644
--- a/src/daemon/service-env.test.ts
+++ b/src/daemon/service-env.test.ts
@@ -282,6 +282,31 @@ describe("buildServiceEnvironment", () => {
     }
   });
 
+  it("forwards TMPDIR from the host environment", () => {
+    const env = buildServiceEnvironment({
+      env: { HOME: "/home/user", TMPDIR: "/var/folders/xw/abc123/T/" },
+      port: 18789,
+    });
+    expect(env.TMPDIR).toBe("/var/folders/xw/abc123/T/");
+  });
+
+  it("forwards LANG from the host environment", () => {
+    const env = buildServiceEnvironment({
+      env: { HOME: "/home/user", LANG: "en_US.UTF-8" },
+      port: 18789,
+    });
+    expect(env.LANG).toBe("en_US.UTF-8");
+  });
+
+  it("omits TMPDIR and LANG when not set in host environment", () => {
+    const env = buildServiceEnvironment({
+      env: { HOME: "/home/user" },
+      port: 18789,
+    });
+    expect(env.TMPDIR).toBeUndefined();
+    expect(env.LANG).toBeUndefined();
+  });
+
   it("uses profile-specific unit and label", () => {
     const env = buildServiceEnvironment({
       env: { HOME: "/home/user", OPENCLAW_PROFILE: "work" },
@@ -301,6 +326,14 @@ describe("buildNodeServiceEnvironment", () => {
     });
     expect(env.HOME).toBe("/home/user");
   });
+
+  it("forwards TMPDIR and LANG for node services", () => {
+    const env = buildNodeServiceEnvironment({
+      env: { HOME: "/home/user", TMPDIR: "/tmp/custom", LANG: "en_US.UTF-8" },
+    });
+    expect(env.TMPDIR).toBe("/tmp/custom");
+    expect(env.LANG).toBe("en_US.UTF-8");
+  });
 });
 
 describe("resolveGatewayStateDir", () => {
diff --git a/src/daemon/service-env.ts b/src/daemon/service-env.ts
index ec6e1a7f3b5..d162de3428a 100644
--- a/src/daemon/service-env.ts
+++ b/src/daemon/service-env.ts
@@ -214,6 +214,8 @@ export function buildServiceEnvironment(params: {
   const configPath = env.OPENCLAW_CONFIG_PATH;
   return {
     HOME: env.HOME,
+    TMPDIR: env.TMPDIR,
+    LANG: env.LANG,
     PATH: buildMinimalServicePath({ env }),
     OPENCLAW_PROFILE: profile,
     OPENCLAW_STATE_DIR: stateDir,
@@ -236,6 +238,8 @@ export function buildNodeServiceEnvironment(params: {
   const configPath = env.OPENCLAW_CONFIG_PATH;
   return {
     HOME: env.HOME,
+    TMPDIR: env.TMPDIR,
+    LANG: env.LANG,
     PATH: buildMinimalServicePath({ env }),
     OPENCLAW_STATE_DIR: stateDir,
     OPENCLAW_CONFIG_PATH: configPath,